This middle/passive verb means to survive, to be among those remaining. Paul uses it twice in his teaching about the rapture in 1 Thessalonians 4. He speaks of 'we who are alive, who remain until the coming of the Lord' (4:15, 17)—those believers still living when Christ returns, as opposed to those who have died. The word emphasizes survival to a specific moment, being part of the remnant that endures to witness a future event. Classical usage described survivors of battle or disaster.